The aim of this study is to develop explicit reflective activities to contribute to the overcoming of alternative concepts in the field of science subject and to introduce the preparation process of these activities. In an activity called "marble", the role of imagination and creativity in science is dealt with the speed of dispersion of light which depends on the context. In the activity of "Guess what I am?" the difference between observation and deduction, the subjectivity and temporariness of the scientific knowledge are focused on. White light's covering all the colours, and the light filters' transferring itself colours which are close to itself in this activity. The prepared activities were piloted and necessary adjustments were made at the end of pilot. It was observed that activities were applicable in the class. (c) 2011 Published by Elsevier Ltd. Open access under CC BY-NC-ND license.